Sofa



FIG. 1 is a front perspective view of a sofa showing my new design;

FIG. 2 is a side elevational view on an enlarged scale, the oppositeside being a mirror image thereof;

FIG. 3 is a top plan view on an enlarged scale;

FIG. 4 is a front elevational view on an enlarged scale;

FIG. 5 is a rear elevational view on an enlarged scale; and

FIG. 6 is a bottom plan view thereof on an enlarged scale.

The ornamental design for a sofa, substantially as shown and described.